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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c171d6141a92bfee1a1678e11718e2e4e2715101866caf3d8d99f32cc8366ad' 
  AND token = '9Em4ARuUjXLe/PGx5dIyXvFMqpVACA/k2WIaC4x2yQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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