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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57f408e78ad93ea032928b03ed815def62ce1bb91447354d680e3c386a9333c' 
  AND token = 'dxjQW4ZgJPJpgsNvI172W1X1zuiVAsVbNWr1BWKwQIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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