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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34281f7ab0f14c7da9328a62840cf22ea3f79d77aaa673fb051bbbc6e631833' 
  AND token = 'MQkuS/3/+LpfehPNTu2vjZOGCJILoDMNCC4YLLXNNGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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