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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ae7301de584e4194ce9f8b052df55f7d25c6325f422906ee4cf58b61fd5359' 
  AND token = 'PKooH6uTlD0xAQ07/a8FgKASu/5hwdJreXE8KIvCHTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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