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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3576ec824a70346efb552c10009f714d383bdf0cdcc98d2db9abcb0d14d6ff7c' 
  AND token = 'r1Lbg1QoX2OrEr6t8rutQby7DT8FClo/l+zcuxH7OeQ=' 
  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"
    }
  }
}