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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ef5e2c4043a8b9a3609e3578d87a45ef926c0d4cbbde531dad48bb5ba5289b' 
  AND token = '8+TMHjgZZ+BNDFFHkLpbEinw1qfyeiR/6NhuD88uWOg=' 
  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"
    }
  }
}