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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b63ec0b4f7876bf94c6c1117103ac80354ef2ff9c2f3b5a91c4763c208963cb' 
  AND token = '/V+UST9Z1/AGRQTQmnQ7NIvZ0Ol6fBQRjTuoRjVB1q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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