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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be6f306c867908b311cd632589b7cd367c2f3d8f3643c939509b9c648d5ae85' 
  AND token = 'iWlU2LfABdZHANnLCZ8Z8n0VK/5UIPGm8b6Jpof4RlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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