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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4777e379590b0c46eb2265df02270291fbbfcdabd0d56daf40c07084018795b7' 
  AND token = '+QSgwlQbDSwAWJPsy/Q4nJSkKaB3f27U1fGZIDcUQw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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