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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149f5ae9cdee4cf1589f2ec855ff75966d845d84860ce551cd1baa67da0e8dfd' 
  AND token = 'icgoKg0C07lgpVCkn7bIGHD4j35haWp6uIQMg6XTeIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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