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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3efb0b3106d87c5f4d0761c34867dea1b08993de10c70004afcfa10a12005f6' 
  AND token = 'Ze01Zlt8k9kbbPgsRu5/oASzR8Wp01vePVRCYAnm4+k=' 
  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"
    }
  }
}