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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3446643e1f9184664c1b010f16887eded49fcfcf23a944a40cbf7a9fb9ead9' 
  AND token = 'GCfFWP8C8gZSFqXwmI3zeuIOthv768hg58AF0lYmNdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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