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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674fd02e4755e4364657afa4d124b9002942f6e3eb3936da17d13275729c5ac2' 
  AND token = 'TGLdnGppU+3Gh0kQXgYEWkKMdLZToThHu3gBxp4DQMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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