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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ce4d2f7d78f78c8c23ee2ff6b2ba671a062c0fbcc561185adfb0595dd780ac' 
  AND token = 'kIQ2XEu7raUp8N1P5xlqFOwH6GgD5xrA5B+KUqJ+r/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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