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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bbe5123aefbb81c5805ab0dc5f0fe0233b34e1be928439294e360e0b8b54c1' 
  AND token = 'GUrDHy76hrc3jbnXHPaMhySlIeLi26IRa9P2a5776UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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