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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec49c28454c064584e5dd9100464be49a777b119fc2b77f3666cbdd996305d8' 
  AND token = 'vV6g9bh4modbGUDYz70eU8tkd3EYcfMZPXCOPbNOiPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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