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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc95a3bb2acf73b8688f3939d8903b5bcffa0d8b540a0bc5b5ce10ab58f9d16b' 
  AND token = '6i9XY+LdT0Svmc0zG9KJljvtzqDmEZH3FP1MovDKRd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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