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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678f46b71eaf15d096ea215e75c42b45e8cebaa89acc81ede1f4750746175231' 
  AND token = 'gnRph/Q+vcE5Sp/BLdCiOJT3q3F5Ourno2r/PLv8a/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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