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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23abab90a5207cea1147b1e20d532b33a87da863f9c8d749f16ec3fb2fe7db1a' 
  AND token = 'osW0dAXD9PujQ4cQzt+7jCpzaJ1APODqCvxytgiai1A=' 
  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"
    }
  }
}