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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82ab03b16f0c8f856fcbef947e1df6d3b4e5aceac1004f6a0653ed7d8489ff2' 
  AND token = 'xFcHe6dbkaE9H+XP3aNWPRfgTgk1DyeRkWnUjDdGr0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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