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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43eaf5bab339fc2f24a716c63bf55a639e18f073b5d76889eb425aa0f86fdb79' 
  AND token = 'jDW198XIGYkQzSNkcLwbAVemWVU9Br1up5n9oZsRclI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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