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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25518f99fdef0fea13d42de6ae721209ce786cbdd26ed17ecc462f9ffde98893' 
  AND token = 'QoD3jN+bN26QTEAn+Bnph/7Dil1Q8Qzz1XZzLhg4Sl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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