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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed25794f9b349b582835f6e23ac028b04bd8a5abc535f1fc0f1d5da287337f5' 
  AND token = 'S9yxNb9vly/mA4QMmHErjiwjiYchKXPBImgguM3E5K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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