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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4eaca6a1f408418d11fff267a8abf6cf03d82773a2e4e07ca29f7f9bba9e12' 
  AND token = 'qJbyZiU3cMQi5ShdEBC0DiLJFKHE8sleJ6tcfAVnZ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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