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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748a34625b0aa33fa7daffd03da0716aef89faa785715249fc6d4bbc9cd7eec3' 
  AND token = 'iODNdXkWHRfVk9LC/5T4zuheiwpHR69ihedBir+CDvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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