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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b3de99513b06d62840fa43be5646585b35ad8b3d4d370ad1411365053946f5' 
  AND token = 'cywKMJY+OAAS1WQSRbzdVxB07CElfIKXRU39JcvRWKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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