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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7be8239b12a665d4f9d2c679328bc54e7da364aa11d5b2ff170469542aff574' 
  AND token = 'Vtdi780s+OU6xJJEuMxJz/D4D9aQCHYXAN1HmgTdlmU=' 
  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"
    }
  }
}