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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f52d33e8e5daa0386fc4ee1400ad44aa7c9738778b8d0fd285c07f1ee833c75' 
  AND token = 'KrmYZMuAOM4uRNiGmSU7/Lmy3RkmwcNi5EvimunLFfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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