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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556692dd5151b274f19aad7c90d5b2080dbda66a14d8e8e4083a3369836058a5' 
  AND token = 'tGwsaQL95Sm9d/DuHM/o1kFGdNKaeedoNF/krSm+Skw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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