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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f64dd578ca93c7d12bcfa05b4485c6c1dfbef8c7269d61e3ef789cccd180a1' 
  AND token = 't6hOo5L4623HUUkbLr0zdC+ii/Z897Mx6UZpJn5LmMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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