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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d65e5a418dc7f9b620b2961f6a45667d327121d9c38fa9dc2e54547d43501ae' 
  AND token = 'zcowhOVylOvueZ2hOwF6h3CuyFdXUce8kV6aQDRl+i4=' 
  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"
    }
  }
}