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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643ff94b7bc6d47abbc1766a5c3b0f9068c6b93f2026e588831788318fd06f7a' 
  AND token = 'Lu8AHNHzHB8c3TO5oghJ0IV1mJhEdVdL5G3vvkl7uZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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