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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17c34b8480a820771388789275004c04b478bab1d8af54508af6acd625e9490' 
  AND token = '0yzK7ZqJL+EN3ncw6o5hew8iG+1qHX2NC1ZIw02vijk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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