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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697767f815c08dc837865ca39bde571be4f081e7bc5d7d410bae7aaeb09630fb' 
  AND token = '0odUXSIcXU5PJ4SXcw7wDHPoTXD0Wwx/G/jR/j4rvAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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