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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fb1a5486ed5d7a39f09df2f8dd3457db370f9ac6b4cf5972b050484298a9d0' 
  AND token = '7yx8JKV0VW/TEE+Uqt534Cv8CXvSHXFg9BYcSgs0Y88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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