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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908da84b1b52bbebafe4a6c362aac2373b06cc6e7e7aec5e5325f53ccbdd3527' 
  AND token = 'Htq/miPcZ1dH8Wsos0ILdfHfE0e06e08EjY3E9oIJeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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