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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b899c5c21c6caab1a44738bb443e8312025096ee1abf28095218a1897cee33ba' 
  AND token = 'HQW70l72YfE3pb1Eq8upbG7GVnIX5wakuoyZTD0VM1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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