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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1816886a114e31848204a2b3cdc6ec2c768e7d0ac73eef4f14abcef5bd9e38e1' 
  AND token = 'yDLr+7wEJg2XfgiWGecy0ziJDjcs0KxO2ucJ3WweTnc=' 
  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"
    }
  }
}