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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db3f1f3975f679cfd6e455f4f63c8f1b117671462ca33de9cb909181077d3e9' 
  AND token = 'Z7oj3m59Knj0QNPWPCdfX8FeTmAJaqnfHD8Jkjd4oKs=' 
  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"
    }
  }
}