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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52effa8dfaea8a7e77a69e356f0043249c153aac5159203b5458786a6076e267' 
  AND token = 's9Z2HYEmppUdi8qJva61Bf0wP510q1e01i6E85uoLzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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