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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc89db5c03842b07fe6c39b333dfe66e7815fe1e60238bafd3181249918ff20' 
  AND token = 'Uk/0zk2Oi2ZL8+skW1L8CB79/8/L9TwtLVubaPlntHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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