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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac4afd3aa7a9be2c6cff44647a87f7cfeca067761811c2d3020264f60a0ef53' 
  AND token = 'KSCobWliqLEX8z3URaBLlNDo4sCQct44kOH0HHcnXIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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