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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b6c848583dea6e2a7de855fdf560f7a44343919f9ac6dafc6383525706d041' 
  AND token = 'JQXwvNwE6yB0EqL2j3n+gV0ZReSw23R/4tRVbLiMlTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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