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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34c933d945f757aa19439142936875a42726b53c49e4878f7f7b34b27ff070b' 
  AND token = 'clmxdolV/nYAU6lHlJuVsybYT5qq3g3p1O0bYqTWb1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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