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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bc113be6008f2b8d67e9e6c7b6cc7a24362456b4ad9208bdc466cc058c5b16' 
  AND token = 'eOGX8gMxu7pco2GE6QYZe9Ovdk25ThHyxo8l/IuZcds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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