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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca87db60bb5e1c1d8cd1e92f336849e652661a9d1f83f1815665eece463deef' 
  AND token = 'mDDR3Q8uDQ2DVvEEdSpj48og3VWgZABzM1vkNuSKDus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}