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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52fb29d8517fb4bd99f4e4ec973139eed27181caf3a35a38c7e5d748d6cecab' 
  AND token = 'POfRt9HcSrYo+9XLnq5d84K2xbs9In5eiN2eGAflGz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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