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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83c1dca1e11990890b9f7633f1338416159a2f842e5165b61c9d154bc231ee0' 
  AND token = 'Sc5dEpmZxJWhD/CSK8x/iDpJZUXJPjd1ovwuS//9e3g=' 
  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"
    }
  }
}