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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b27f5de88a5ed5601a0c329aac6db867e45607ad41278c03daa710b0303b95' 
  AND token = '9tOvIytWZpw3ONclB2jUP488I8CIYyhQyIro0UC7tVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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