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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e1eddcfc745977336e4c8fe4c506bc50859570660b372d80e235c4ab8a875f' 
  AND token = 'XcjCaJf7T1g9le2VjvFh9nPA1ALpgDj4tPpf8tbee6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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