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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4a55367fc711f8f2d5a8bd1e9e79d81852cebe9320ed6f3231f3e09b5cb739' 
  AND token = '2SNqmdBNP/+gLQXXNbbI+sMo76P/Sqlb+uqeIGb6W/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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