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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7f4b747da99305145398d506a9bc39095a29861eab44e4ffcd4e80e00f0b37' 
  AND token = 'l7z/SbizDGagZOLozfR+xFjKtMTMfyheAlMPWIjrZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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