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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a67f511e37de45f818a16443d6e5a8196965476a91e553699c146b51d4bcc80' 
  AND token = 'UdaNvoV+DIdofKgdHEX2M5t5HUfsyTD16Ja0H3mC3IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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