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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89c4da2c239e5871bbcb396d580f5e54691fc3347906fa7bf701d9f2a5802fb' 
  AND token = 'v4Z1LH8phNigEN4XfHWgnE7J2mu6tIurj6ntdbPbCRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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