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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb8a318d839a9f5fd93527efb5f38159b1c25faa4a0cf0531d8b15028d51d98' 
  AND token = 'NHX511KVqUYURlZ9loelGqXZLP4bNa2Q3gbpDxKcuC4=' 
  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"
    }
  }
}