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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff25e97cc9952e90b5c06f3e50bc259d50a56d3f0f5e24ff740a99249ce7bfc' 
  AND token = 'cp6Xyeftcl3avvyuTDd4kYWJLFtFPf1MBGpI+/yrg9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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