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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00da83bd9f833fab2d20f623ecef9d12f35916f5fdf59deddc1a851e4eabe3a3' 
  AND token = 'j6o7xWmrLTKf+XMy8i1iX8BY7ONdHPDy7BemQ8SJIsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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